Chromium Concentrate Recovery from Solid Tannery Waste in a Thermal Process
AbstractLeatherprocessingrequiressubstantialinputsofenergy,waterandchemicals. Additionally, it generates signiﬁcant amounts of liquid and solid waste, severely impacting the environment. Processing 1 Mg of raw hides yields up to 600–700 kg of waste, considerable amounts of which are solid tannery waste. Such waste contains chromium (Cr) compounds, which are commonly used as tanning agents. This paper reviews solid tannery waste treatment technologies, with emphasis on waste incineration in a specially designed experimental tunnel incinerator. Three diﬀerent types of tannery waste were subjected to tests: trimmings, shavings and buﬃng dust. As the research revealed,theprocesscanbeappliedtoalltypesofsolidtannerywaste. Moreover,itenablesthereuse of the heat of the process and results in a Cr concentrate in the process residues. The conducted analyses (carbon, hydrogen and nitrogen elemental analysis; inductively coupled plasma optical emission spectroscopy; powder X-ray diﬀraction) proved that there is no or little organic content in the obtained residual ash, which contains up to 53.1%(w/w) Cr in the form of Cr (III) oxide. Such material may be used as a Cr ore substitute in the chemical or metallurgical industries.
|Journal series||Materials, ISSN 1996-1944, (N/A 140 pkt)|
|Publication size in sheets||0.6|
|Keywords in English||tannery waste; chromium recovery; chromium concentrate; waste incineration|
|License||Journal (articles only); author's original; ; after publication|
|Publication indicators||: 2017 = 1.285; : 2018 = 2.972 (2) - 2018=3.532 (5)|
|Finansowanie||The construction of the experimental installation for waste incineration was supported by the Ministry of Science and Higher Education (Poland), Project No. N R14 0028 06. This research paper was ﬁnanced by the Ministry of Science and Higher Education of the Republic of Poland.|
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